Features: brand new and high quality STM32F407 default onbard,F446H7434x RP2040 optional. 10 stepper drivers support, 6x 3A/28V Max,4x 6A/60V Max. Intelligent identification of driver type, automatic switching of UART/SPI channel. 28V input max,12V@3A DC-DC,5V@3A DC-DC,5V@4A Isolated DC-DC ,Separate VIO power supply circuit for stepper motor. Three car fuses for hot bed input / main power input / Motor Power Input. Limit switch socket 24V/5V/3.3V optional, ready for more other equipment, such as -inductive sensor, BL-Touch.XH2.54 High temperature resistance connectors. 12x PWM capable power mosfet outputs (1 for HotBed, 5 for Heat-End, 6 for fans). Up to 6 temperature sensors support. Up to 6 ways PWM fans. 5V-RGB led (NEO-PIXEL/WS2812/SK6812). RepRapDiscount SmartController compatible pin header on board(EXP1 & EXP2). UART/SPI Raspberry Pi connector (including Isolated 5V@4A power supply). Onboard micro-SD card. Type-C USB connector. EXP1 & EXP2 have more multiplexing functions, such as USART, I2C, CAN. SD card & USB upload support. A 4.7kOhm 0.1% temperature sensor pull up resistor is used, PT1000 can be connected directly. For PT100, an amplifier board must be used. 5000V digital isolation between all motor drive sockets Tim and control core. 3750V optocoupler isolation between all MOSFET outputs and the control core. Package Includes: 1 x Spider King Motherboard Specifications: Size: approx. 177x108mm/6.97x4.25in note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.